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The spec states: ``` A sub-surface becomes mapped, when a non-NULL wl_buffer is applied and the parent surface is mapped. The order of which one happens first is irrelevant. A sub-surface is hidden if the parent becomes hidden, or if a NULL wl_buffer is applied. These rules apply recursively through the tree of surfaces. ``` In the past we relied on Clutter actor behaviour to realize the recursive part - which then broke in https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/664 when we changed the actor hierachy in regards to subsurfaces. Explicitly encode the desired behaviour in `MetaWaylandSubsurface`, fixing the issue and making it future proof. Closes https://gitlab.gnome.org/GNOME/mutter/-/issues/1384